Young posted a disappointing slash line of .231/.311/.434 in 101 games in 2012 for Arizona. The 2010 All-Star was slowed by a shoulder injury he sustained slamming into the left-field wall at Chase Field. The injury ruined a hot start that saw him hit five home runs and register a 1.397 OPS in the first 11 games. On the year, Young wound up with 14 home runs and 41 RBI.

The trade brings Pennington's five-year career with Oakland to an end. A career .249 hitter, Pennington struggled for much of 2012, hitting a career-low .215 with six home runs and 28 RBI. His versatility came in handy after Oakland acquired Stephen Drew from Arizona, as he moved from shortstop to second base.

Bell, who grew disenchanted with his role in Miami, likely will get another chance to close in Arizona. The former All-Star struggled in his only year with the Marlins, posting a 5.09 ERA with 8.3 K/9 and 4.1 BB/9 in 73 appearances. In return, the Marlins will receive A's infield prospect Yordy Cabrera, who was initially dealt to Arizona in the Young trade.